Re: Clean Object Class Design -- Circle/Ellipse

Martijn Meijering a écrit :
>
> A nonempty set G combined with a binary operation + is called a commutative
> group if the following axioms hold:
>
> associativity: (a+b)+c=a+(b+c) for all a,b,c in G
> neutral element: there exists an element (denoted 0) such that a+0=0+a=0
> for all a in G

Is'nt it a+0=0+a= a ?

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HTH
A. Deppierraz Received on Sun Aug 05 2001 - 05:00:40 CDT